:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #38bdf8;
    --light: #f8fafc;
    --dark: #0f172a;
    --gray: #64748b;
    --success: #10b981;
    --feature-blue: #3b82f6;
    --feature-green: #10b981;
    --feature-purple: #8b5cf6;
    --feature-orange: #f97316;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f1f5f9;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a.active {
    color: var(--primary);
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 8px 20px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-decoration: none;
    display: inline-block;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background-color: var(--primary);
    color: white;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

/* 页面标题区域 */
.page-header {
    padding: 80px 0 50px;
    text-align: center;
    background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 100%);
}

.page-header h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.page-header p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* 功能类别 */
.feature-categories {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-title p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

.categories-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.category-card {
    background-color: white;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border-top: 4px solid var(--primary);
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.category-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 1.8rem;
}

.category-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.category-card p {
    color: var(--gray);
    margin-bottom: 20px;
}

/* 功能详情部分 */
.feature-details {
    padding: 70px 0;
    background-color: white;
}

.feature-container {
    background-color: #f8fafc;
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 50px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.feature-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    gap: 20px;
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    flex-shrink: 0;
}

.feature-info h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.feature-info p {
    color: var(--gray);
}

.feature-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.feature-item {
    background-color: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-item h3 i {
    color: var(--primary);
    font-size: 1.2rem;
}

.feature-item p {
    color: var(--gray);
    font-size: 0.95rem;
}

.feature-example {
    background-color: white;
    border-radius: 12px;
    padding: 25px;
    margin-top: 30px;
    border-left: 4px solid var(--primary);
}

.example-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.example-header i {
    font-size: 1.5rem;
    color: var(--primary);
}

.example-header h3 {
    font-size: 1.3rem;
    color: var(--dark);
}

.example-content {
    padding: 20px;
    background-color: #f1f5f9;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
}

/* 优势展示部分 */
.benefits {
    padding: 70px 0;
    background: linear-gradient(to bottom, #f0f9ff, #e0f2fe);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.benefit-card {
    background-color: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
}

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.benefit-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 1.8rem;
}

.benefit-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.benefit-card p {
    color: var(--gray);
}

/* 行动号召区域 */
.cta {
    padding: 100px 0;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.cta p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto 40px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn-lg {
    padding: 12px 30px;
    font-size: 1.1rem;
}

/* 响应式设计 */
@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .page-header h1 {
        font-size: 2.2rem;
    }

    .feature-header {
        flex-direction: column;
        text-align: center;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}